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7
8#include <linux/clk.h>
9#include <linux/delay.h>
10#include <linux/io.h>
11#include <linux/module.h>
12#include <linux/mutex.h>
13#include <linux/of.h>
14#include <linux/of_graph.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17
18#include <media/v4l2-ctrls.h>
19#include <media/v4l2-device.h>
20#include <media/v4l2-fwnode.h>
21#include <media/v4l2-subdev.h>
22
23#define CSI2TX_DEVICE_CONFIG_REG 0x00
24#define CSI2TX_DEVICE_CONFIG_STREAMS_MASK GENMASK(6, 4)
25#define CSI2TX_DEVICE_CONFIG_HAS_DPHY BIT(3)
26#define CSI2TX_DEVICE_CONFIG_LANES_MASK GENMASK(2, 0)
27
28#define CSI2TX_CONFIG_REG 0x20
29#define CSI2TX_CONFIG_CFG_REQ BIT(2)
30#define CSI2TX_CONFIG_SRST_REQ BIT(1)
31
32#define CSI2TX_DPHY_CFG_REG 0x28
33#define CSI2TX_DPHY_CFG_CLK_RESET BIT(16)
34#define CSI2TX_DPHY_CFG_LANE_RESET(n) BIT((n) + 12)
35#define CSI2TX_DPHY_CFG_MODE_MASK GENMASK(9, 8)
36#define CSI2TX_DPHY_CFG_MODE_LPDT (2 << 8)
37#define CSI2TX_DPHY_CFG_MODE_HS (1 << 8)
38#define CSI2TX_DPHY_CFG_MODE_ULPS (0 << 8)
39#define CSI2TX_DPHY_CFG_CLK_ENABLE BIT(4)
40#define CSI2TX_DPHY_CFG_LANE_ENABLE(n) BIT(n)
41
42#define CSI2TX_DPHY_CLK_WAKEUP_REG 0x2c
43#define CSI2TX_DPHY_CLK_WAKEUP_ULPS_CYCLES(n) ((n) & 0xffff)
44
45#define CSI2TX_DT_CFG_REG(n) (0x80 + (n) * 8)
46#define CSI2TX_DT_CFG_DT(n) (((n) & 0x3f) << 2)
47
48#define CSI2TX_DT_FORMAT_REG(n) (0x84 + (n) * 8)
49#define CSI2TX_DT_FORMAT_BYTES_PER_LINE(n) (((n) & 0xffff) << 16)
50#define CSI2TX_DT_FORMAT_MAX_LINE_NUM(n) ((n) & 0xffff)
51
52#define CSI2TX_STREAM_IF_CFG_REG(n) (0x100 + (n) * 4)
53#define CSI2TX_STREAM_IF_CFG_FILL_LEVEL(n) ((n) & 0x1f)
54
55
56#define CSI2TX_V2_DPHY_CFG_REG 0x28
57#define CSI2TX_V2_DPHY_CFG_RESET BIT(16)
58#define CSI2TX_V2_DPHY_CFG_CLOCK_MODE BIT(10)
59#define CSI2TX_V2_DPHY_CFG_MODE_MASK GENMASK(9, 8)
60#define CSI2TX_V2_DPHY_CFG_MODE_LPDT (2 << 8)
61#define CSI2TX_V2_DPHY_CFG_MODE_HS (1 << 8)
62#define CSI2TX_V2_DPHY_CFG_MODE_ULPS (0 << 8)
63#define CSI2TX_V2_DPHY_CFG_CLK_ENABLE BIT(4)
64#define CSI2TX_V2_DPHY_CFG_LANE_ENABLE(n) BIT(n)
65
66#define CSI2TX_LANES_MAX 4
67#define CSI2TX_STREAMS_MAX 4
68
69enum csi2tx_pads {
70 CSI2TX_PAD_SOURCE,
71 CSI2TX_PAD_SINK_STREAM0,
72 CSI2TX_PAD_SINK_STREAM1,
73 CSI2TX_PAD_SINK_STREAM2,
74 CSI2TX_PAD_SINK_STREAM3,
75 CSI2TX_PAD_MAX,
76};
77
78struct csi2tx_fmt {
79 u32 mbus;
80 u32 dt;
81 u32 bpp;
82};
83
84struct csi2tx_priv;
85
86
87struct csi2tx_vops {
88 void (*dphy_setup)(struct csi2tx_priv *csi2tx);
89};
90
91struct csi2tx_priv {
92 struct device *dev;
93 unsigned int count;
94
95
96
97
98
99 struct mutex lock;
100
101 void __iomem *base;
102
103 struct csi2tx_vops *vops;
104
105 struct clk *esc_clk;
106 struct clk *p_clk;
107 struct clk *pixel_clk[CSI2TX_STREAMS_MAX];
108
109 struct v4l2_subdev subdev;
110 struct media_pad pads[CSI2TX_PAD_MAX];
111 struct v4l2_mbus_framefmt pad_fmts[CSI2TX_PAD_MAX];
112
113 bool has_internal_dphy;
114 u8 lanes[CSI2TX_LANES_MAX];
115 unsigned int num_lanes;
116 unsigned int max_lanes;
117 unsigned int max_streams;
118};
119
120static const struct csi2tx_fmt csi2tx_formats[] = {
121 {
122 .mbus = MEDIA_BUS_FMT_UYVY8_1X16,
123 .bpp = 2,
124 .dt = 0x1e,
125 },
126 {
127 .mbus = MEDIA_BUS_FMT_RGB888_1X24,
128 .bpp = 3,
129 .dt = 0x24,
130 },
131};
132
133static const struct v4l2_mbus_framefmt fmt_default = {
134 .width = 1280,
135 .height = 720,
136 .code = MEDIA_BUS_FMT_RGB888_1X24,
137 .field = V4L2_FIELD_NONE,
138 .colorspace = V4L2_COLORSPACE_DEFAULT,
139};
140
141static inline
142struct csi2tx_priv *v4l2_subdev_to_csi2tx(struct v4l2_subdev *subdev)
143{
144 return container_of(subdev, struct csi2tx_priv, subdev);
145}
146
147static const struct csi2tx_fmt *csi2tx_get_fmt_from_mbus(u32 mbus)
148{
149 unsigned int i;
150
151 for (i = 0; i < ARRAY_SIZE(csi2tx_formats); i++)
152 if (csi2tx_formats[i].mbus == mbus)
153 return &csi2tx_formats[i];
154
155 return NULL;
156}
157
158static int csi2tx_enum_mbus_code(struct v4l2_subdev *subdev,
159 struct v4l2_subdev_pad_config *cfg,
160 struct v4l2_subdev_mbus_code_enum *code)
161{
162 if (code->pad || code->index >= ARRAY_SIZE(csi2tx_formats))
163 return -EINVAL;
164
165 code->code = csi2tx_formats[code->index].mbus;
166
167 return 0;
168}
169
170static struct v4l2_mbus_framefmt *
171__csi2tx_get_pad_format(struct v4l2_subdev *subdev,
172 struct v4l2_subdev_pad_config *cfg,
173 struct v4l2_subdev_format *fmt)
174{
175 struct csi2tx_priv *csi2tx = v4l2_subdev_to_csi2tx(subdev);
176
177 if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
178 return v4l2_subdev_get_try_format(subdev, cfg,
179 fmt->pad);
180
181 return &csi2tx->pad_fmts[fmt->pad];
182}
183
184static int csi2tx_get_pad_format(struct v4l2_subdev *subdev,
185 struct v4l2_subdev_pad_config *cfg,
186 struct v4l2_subdev_format *fmt)
187{
188 const struct v4l2_mbus_framefmt *format;
189
190
191 if (fmt->pad == CSI2TX_PAD_SOURCE)
192 return -EINVAL;
193
194 format = __csi2tx_get_pad_format(subdev, cfg, fmt);
195 if (!format)
196 return -EINVAL;
197
198 fmt->format = *format;
199
200 return 0;
201}
202
203static int csi2tx_set_pad_format(struct v4l2_subdev *subdev,
204 struct v4l2_subdev_pad_config *cfg,
205 struct v4l2_subdev_format *fmt)
206{
207 const struct v4l2_mbus_framefmt *src_format = &fmt->format;
208 struct v4l2_mbus_framefmt *dst_format;
209
210
211 if (fmt->pad == CSI2TX_PAD_SOURCE)
212 return -EINVAL;
213
214 if (!csi2tx_get_fmt_from_mbus(fmt->format.code))
215 src_format = &fmt_default;
216
217 dst_format = __csi2tx_get_pad_format(subdev, cfg, fmt);
218 if (!dst_format)
219 return -EINVAL;
220
221 *dst_format = *src_format;
222
223 return 0;
224}
225
226static const struct v4l2_subdev_pad_ops csi2tx_pad_ops = {
227 .enum_mbus_code = csi2tx_enum_mbus_code,
228 .get_fmt = csi2tx_get_pad_format,
229 .set_fmt = csi2tx_set_pad_format,
230};
231
232
233static void csi2tx_dphy_set_wakeup(struct csi2tx_priv *csi2tx)
234{
235 writel(CSI2TX_DPHY_CLK_WAKEUP_ULPS_CYCLES(32),
236 csi2tx->base + CSI2TX_DPHY_CLK_WAKEUP_REG);
237}
238
239
240
241
242
243static void csi2tx_dphy_init_finish(struct csi2tx_priv *csi2tx, u32 reg)
244{
245 unsigned int i;
246
247 udelay(10);
248
249
250 reg |= CSI2TX_DPHY_CFG_CLK_ENABLE;
251 for (i = 0; i < csi2tx->num_lanes; i++)
252 reg |= CSI2TX_DPHY_CFG_LANE_ENABLE(csi2tx->lanes[i] - 1);
253 writel(reg, csi2tx->base + CSI2TX_DPHY_CFG_REG);
254
255 udelay(10);
256
257
258 reg &= ~CSI2TX_DPHY_CFG_MODE_MASK;
259 writel(reg | CSI2TX_DPHY_CFG_MODE_HS,
260 csi2tx->base + CSI2TX_DPHY_CFG_REG);
261}
262
263
264static void csi2tx_dphy_setup(struct csi2tx_priv *csi2tx)
265{
266 u32 reg;
267 unsigned int i;
268
269 csi2tx_dphy_set_wakeup(csi2tx);
270
271
272 reg = CSI2TX_DPHY_CFG_CLK_RESET | CSI2TX_DPHY_CFG_MODE_LPDT;
273 for (i = 0; i < csi2tx->num_lanes; i++)
274 reg |= CSI2TX_DPHY_CFG_LANE_RESET(csi2tx->lanes[i] - 1);
275 writel(reg, csi2tx->base + CSI2TX_DPHY_CFG_REG);
276
277 csi2tx_dphy_init_finish(csi2tx, reg);
278}
279
280
281static void csi2tx_v2_dphy_setup(struct csi2tx_priv *csi2tx)
282{
283 u32 reg;
284
285 csi2tx_dphy_set_wakeup(csi2tx);
286
287
288 reg = CSI2TX_V2_DPHY_CFG_RESET | CSI2TX_V2_DPHY_CFG_MODE_LPDT;
289 writel(reg, csi2tx->base + CSI2TX_V2_DPHY_CFG_REG);
290
291 csi2tx_dphy_init_finish(csi2tx, reg);
292}
293
294static void csi2tx_reset(struct csi2tx_priv *csi2tx)
295{
296 writel(CSI2TX_CONFIG_SRST_REQ, csi2tx->base + CSI2TX_CONFIG_REG);
297
298 udelay(10);
299}
300
301static int csi2tx_start(struct csi2tx_priv *csi2tx)
302{
303 struct media_entity *entity = &csi2tx->subdev.entity;
304 struct media_link *link;
305 unsigned int i;
306
307 csi2tx_reset(csi2tx);
308
309 writel(CSI2TX_CONFIG_CFG_REQ, csi2tx->base + CSI2TX_CONFIG_REG);
310
311 udelay(10);
312
313 if (csi2tx->vops && csi2tx->vops->dphy_setup) {
314 csi2tx->vops->dphy_setup(csi2tx);
315 udelay(10);
316 }
317
318
319
320
321
322
323
324
325
326
327
328
329 list_for_each_entry(link, &entity->links, list) {
330 struct v4l2_mbus_framefmt *mfmt;
331 const struct csi2tx_fmt *fmt;
332 unsigned int stream;
333 int pad_idx = -1;
334
335
336 for (i = CSI2TX_PAD_SINK_STREAM0; i < CSI2TX_PAD_MAX; i++) {
337 struct media_pad *pad = &csi2tx->pads[i];
338
339 if ((pad == link->sink) &&
340 (link->flags & MEDIA_LNK_FL_ENABLED)) {
341 pad_idx = i;
342 break;
343 }
344 }
345
346 if (pad_idx < 0)
347 continue;
348
349 mfmt = &csi2tx->pad_fmts[pad_idx];
350 fmt = csi2tx_get_fmt_from_mbus(mfmt->code);
351 if (!fmt)
352 continue;
353
354 stream = pad_idx - CSI2TX_PAD_SINK_STREAM0;
355
356
357
358
359
360
361
362
363 writel(CSI2TX_DT_CFG_DT(fmt->dt),
364 csi2tx->base + CSI2TX_DT_CFG_REG(stream));
365
366 writel(CSI2TX_DT_FORMAT_BYTES_PER_LINE(mfmt->width * fmt->bpp) |
367 CSI2TX_DT_FORMAT_MAX_LINE_NUM(mfmt->height + 1),
368 csi2tx->base + CSI2TX_DT_FORMAT_REG(stream));
369
370
371
372
373
374 writel(CSI2TX_STREAM_IF_CFG_FILL_LEVEL(4),
375 csi2tx->base + CSI2TX_STREAM_IF_CFG_REG(stream));
376 }
377
378
379 writel(0, csi2tx->base + CSI2TX_CONFIG_REG);
380
381 return 0;
382}
383
384static void csi2tx_stop(struct csi2tx_priv *csi2tx)
385{
386 writel(CSI2TX_CONFIG_CFG_REQ | CSI2TX_CONFIG_SRST_REQ,
387 csi2tx->base + CSI2TX_CONFIG_REG);
388}
389
390static int csi2tx_s_stream(struct v4l2_subdev *subdev, int enable)
391{
392 struct csi2tx_priv *csi2tx = v4l2_subdev_to_csi2tx(subdev);
393 int ret = 0;
394
395 mutex_lock(&csi2tx->lock);
396
397 if (enable) {
398
399
400
401
402 if (!csi2tx->count) {
403 ret = csi2tx_start(csi2tx);
404 if (ret)
405 goto out;
406 }
407
408 csi2tx->count++;
409 } else {
410 csi2tx->count--;
411
412
413
414
415 if (!csi2tx->count)
416 csi2tx_stop(csi2tx);
417 }
418
419out:
420 mutex_unlock(&csi2tx->lock);
421 return ret;
422}
423
424static const struct v4l2_subdev_video_ops csi2tx_video_ops = {
425 .s_stream = csi2tx_s_stream,
426};
427
428static const struct v4l2_subdev_ops csi2tx_subdev_ops = {
429 .pad = &csi2tx_pad_ops,
430 .video = &csi2tx_video_ops,
431};
432
433static int csi2tx_get_resources(struct csi2tx_priv *csi2tx,
434 struct platform_device *pdev)
435{
436 struct resource *res;
437 unsigned int i;
438 u32 dev_cfg;
439
440 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
441 csi2tx->base = devm_ioremap_resource(&pdev->dev, res);
442 if (IS_ERR(csi2tx->base))
443 return PTR_ERR(csi2tx->base);
444
445 csi2tx->p_clk = devm_clk_get(&pdev->dev, "p_clk");
446 if (IS_ERR(csi2tx->p_clk)) {
447 dev_err(&pdev->dev, "Couldn't get p_clk\n");
448 return PTR_ERR(csi2tx->p_clk);
449 }
450
451 csi2tx->esc_clk = devm_clk_get(&pdev->dev, "esc_clk");
452 if (IS_ERR(csi2tx->esc_clk)) {
453 dev_err(&pdev->dev, "Couldn't get the esc_clk\n");
454 return PTR_ERR(csi2tx->esc_clk);
455 }
456
457 clk_prepare_enable(csi2tx->p_clk);
458 dev_cfg = readl(csi2tx->base + CSI2TX_DEVICE_CONFIG_REG);
459 clk_disable_unprepare(csi2tx->p_clk);
460
461 csi2tx->max_lanes = dev_cfg & CSI2TX_DEVICE_CONFIG_LANES_MASK;
462 if (csi2tx->max_lanes > CSI2TX_LANES_MAX) {
463 dev_err(&pdev->dev, "Invalid number of lanes: %u\n",
464 csi2tx->max_lanes);
465 return -EINVAL;
466 }
467
468 csi2tx->max_streams = (dev_cfg & CSI2TX_DEVICE_CONFIG_STREAMS_MASK) >> 4;
469 if (csi2tx->max_streams > CSI2TX_STREAMS_MAX) {
470 dev_err(&pdev->dev, "Invalid number of streams: %u\n",
471 csi2tx->max_streams);
472 return -EINVAL;
473 }
474
475 csi2tx->has_internal_dphy = !!(dev_cfg & CSI2TX_DEVICE_CONFIG_HAS_DPHY);
476
477 for (i = 0; i < csi2tx->max_streams; i++) {
478 char clk_name[16];
479
480 snprintf(clk_name, sizeof(clk_name), "pixel_if%u_clk", i);
481 csi2tx->pixel_clk[i] = devm_clk_get(&pdev->dev, clk_name);
482 if (IS_ERR(csi2tx->pixel_clk[i])) {
483 dev_err(&pdev->dev, "Couldn't get clock %s\n",
484 clk_name);
485 return PTR_ERR(csi2tx->pixel_clk[i]);
486 }
487 }
488
489 return 0;
490}
491
492static int csi2tx_check_lanes(struct csi2tx_priv *csi2tx)
493{
494 struct v4l2_fwnode_endpoint v4l2_ep = { .bus_type = 0 };
495 struct device_node *ep;
496 int ret, i;
497
498 ep = of_graph_get_endpoint_by_regs(csi2tx->dev->of_node, 0, 0);
499 if (!ep)
500 return -EINVAL;
501
502 ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &v4l2_ep);
503 if (ret) {
504 dev_err(csi2tx->dev, "Could not parse v4l2 endpoint\n");
505 goto out;
506 }
507
508 if (v4l2_ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
509 dev_err(csi2tx->dev, "Unsupported media bus type: 0x%x\n",
510 v4l2_ep.bus_type);
511 ret = -EINVAL;
512 goto out;
513 }
514
515 csi2tx->num_lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes;
516 if (csi2tx->num_lanes > csi2tx->max_lanes) {
517 dev_err(csi2tx->dev,
518 "Current configuration uses more lanes than supported\n");
519 ret = -EINVAL;
520 goto out;
521 }
522
523 for (i = 0; i < csi2tx->num_lanes; i++) {
524 if (v4l2_ep.bus.mipi_csi2.data_lanes[i] < 1) {
525 dev_err(csi2tx->dev, "Invalid lane[%d] number: %u\n",
526 i, v4l2_ep.bus.mipi_csi2.data_lanes[i]);
527 ret = -EINVAL;
528 goto out;
529 }
530 }
531
532 memcpy(csi2tx->lanes, v4l2_ep.bus.mipi_csi2.data_lanes,
533 sizeof(csi2tx->lanes));
534
535out:
536 of_node_put(ep);
537 return ret;
538}
539
540static const struct csi2tx_vops csi2tx_vops = {
541 .dphy_setup = csi2tx_dphy_setup,
542};
543
544static const struct csi2tx_vops csi2tx_v2_vops = {
545 .dphy_setup = csi2tx_v2_dphy_setup,
546};
547
548static const struct of_device_id csi2tx_of_table[] = {
549 {
550 .compatible = "cdns,csi2tx",
551 .data = &csi2tx_vops
552 },
553 {
554 .compatible = "cdns,csi2tx-1.3",
555 .data = &csi2tx_vops
556 },
557 {
558 .compatible = "cdns,csi2tx-2.1",
559 .data = &csi2tx_v2_vops
560 },
561 { }
562};
563MODULE_DEVICE_TABLE(of, csi2tx_of_table);
564
565static int csi2tx_probe(struct platform_device *pdev)
566{
567 struct csi2tx_priv *csi2tx;
568 const struct of_device_id *of_id;
569 unsigned int i;
570 int ret;
571
572 csi2tx = kzalloc(sizeof(*csi2tx), GFP_KERNEL);
573 if (!csi2tx)
574 return -ENOMEM;
575 platform_set_drvdata(pdev, csi2tx);
576 mutex_init(&csi2tx->lock);
577 csi2tx->dev = &pdev->dev;
578
579 ret = csi2tx_get_resources(csi2tx, pdev);
580 if (ret)
581 goto err_free_priv;
582
583 of_id = of_match_node(csi2tx_of_table, pdev->dev.of_node);
584 csi2tx->vops = (struct csi2tx_vops *)of_id->data;
585
586 v4l2_subdev_init(&csi2tx->subdev, &csi2tx_subdev_ops);
587 csi2tx->subdev.owner = THIS_MODULE;
588 csi2tx->subdev.dev = &pdev->dev;
589 csi2tx->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
590 snprintf(csi2tx->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.%s",
591 KBUILD_MODNAME, dev_name(&pdev->dev));
592
593 ret = csi2tx_check_lanes(csi2tx);
594 if (ret)
595 goto err_free_priv;
596
597
598 csi2tx->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
599 csi2tx->pads[CSI2TX_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
600 for (i = CSI2TX_PAD_SINK_STREAM0; i < CSI2TX_PAD_MAX; i++)
601 csi2tx->pads[i].flags = MEDIA_PAD_FL_SINK;
602
603
604
605
606
607
608
609 for (i = CSI2TX_PAD_SINK_STREAM0; i < CSI2TX_PAD_MAX; i++)
610 csi2tx->pad_fmts[i] = fmt_default;
611
612 ret = media_entity_pads_init(&csi2tx->subdev.entity, CSI2TX_PAD_MAX,
613 csi2tx->pads);
614 if (ret)
615 goto err_free_priv;
616
617 ret = v4l2_async_register_subdev(&csi2tx->subdev);
618 if (ret < 0)
619 goto err_free_priv;
620
621 dev_info(&pdev->dev,
622 "Probed CSI2TX with %u/%u lanes, %u streams, %s D-PHY\n",
623 csi2tx->num_lanes, csi2tx->max_lanes, csi2tx->max_streams,
624 csi2tx->has_internal_dphy ? "internal" : "no");
625
626 return 0;
627
628err_free_priv:
629 kfree(csi2tx);
630 return ret;
631}
632
633static int csi2tx_remove(struct platform_device *pdev)
634{
635 struct csi2tx_priv *csi2tx = platform_get_drvdata(pdev);
636
637 v4l2_async_unregister_subdev(&csi2tx->subdev);
638 kfree(csi2tx);
639
640 return 0;
641}
642
643static struct platform_driver csi2tx_driver = {
644 .probe = csi2tx_probe,
645 .remove = csi2tx_remove,
646
647 .driver = {
648 .name = "cdns-csi2tx",
649 .of_match_table = csi2tx_of_table,
650 },
651};
652module_platform_driver(csi2tx_driver);
653MODULE_AUTHOR("Maxime Ripard <maxime.ripard@bootlin.com>");
654MODULE_DESCRIPTION("Cadence CSI2-TX controller");
655MODULE_LICENSE("GPL");
656
